A grid system for supporting a suspended ceiling and ceiling mounted equipment includes a plurality of grid elements which are interconnected in a orthogonal grid pattern. The grid elements have a wire raceway located at their upper end which is accessible from above the grid element. Flanges located at lower portions of the grid elements engage the equipment supported by the grid system.
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1. A grid element for supporting a suspended ceiling, the grid element comprising:
an upper grid element including first walls and a bottom wall that cooperate to define an upper cavity having an upwardly facing opening that extends along at least a portion of a length of the grid element, the upper cavity including an upper raceway;
a lower grid element including second walls and a top wall that cooperate to define a lower cavity having a downwardly facing opening that extends along at least at least a portion of a length of the grid element, the lower cavity including a lower raceway, the upper and lower raceways sized to receive at least one of wire and an electrical component therein, wherein the upwardly facing opening and the downwardly facing opening enable access to the at least one of wire and components in the upper and lower cavities from both above and below the grid element;
at least two web extending between the bottom wall and the top wall to separate the upper grid element and the lower element, the two web sections positioned apart to define at least one gap therebetween;
a hollow tube positioned within the at least one gap and extending between the bottom wall and the top wall to operably connecting the upper raceway and the lower raceway such that electrical wiring is navigable between the upper raceway and the lower raceway; and
a top plate defining a generally planar portion positioned between side edges, the side edges being engagable by upper ends of the first walls proximate to the upwardly facing opening, the top plate for receiving at least one fastener to couple the grid element to a hanger that supports the grid element, wherein the top plate is elongated to enclose a portion of the upper raceway.
21. A grid element for supporting a suspended ceiling, the grid element comprising:
an upper grid element including first walls and a bottom wall that cooperate to define an upper cavity having an upwardly facing opening that extends along at least a portion of a length of the grid element and a closed lower end opposite the upwardly facing opening, the first walls defining a width between the first walls and a height defined between the upwardly facing opening and the closed lower end, the upper cavity including an upper raceway;
a lower grid element including second walls and a top wall that cooperate to define a lower cavity having a downwardly facing opening that extends along at least at least a portion of a length of the grid element, the lower cavity including a lower raceway, the upper and lower raceways sized to receive at least one of wire and an electrical component therein, wherein the upwardly facing opening and the downwardly facing opening enable access to the at least one of wire and components in the upper and lower cavities from both above and below the grid element;
at least two web extending between the bottom wall and the top wall to separate the upper grid element and the lower element, the two web sections positioned apart to define at least one gap therebetween;
a hollow tube positioned within the at least one gap and extending between the bottom wall and the top wall to operably connecting the upper raceway and the lower raceway such that the wire is navigable between the upper raceway and the lower raceway; and
a top plate defining a generally planar portion positioned between side edges, the side edges being engagable by upper ends of the first walls proximate to the upwardly facing opening, the top plate for receiving at least one fastener to couple the grid element to a hanger that supports the grid element, wherein the height of the first walls creates a minimum distance from the fastener and the closed lower end greater than the width between the first walls, wherein the top plate is elongated to enclose a portion of the upper raceway.
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This invention relates to a grid system for a suspended ceiling and in particular to a grid system having the grid elements with raceways in which wires can be carried.
Suspended ceilings which support equipment are common in many types of commercial buildings. Clean rooms used in chip manufacture and hospitals use ceilings to support fan filter units, lights and other equipment. This equipment has wiring that provides power (high voltage wiring) and control systems (low voltage wiring). This wiring is located above the ceiling and is typically placed in raceways to protect the wire and keep it contained. Separate raceways typically are used for the high voltage and low voltage wiring.
The equipment is located throughout the ceiling so the raceways must run both longitudinally and laterally. As a result, the raceways utilize considerable space above the ceiling preventing this space from being fully utilized to contain other components and making it difficult for workers maintaining the equipment mounted in the ceiling from working in the space. In addition, since the raceways and wiring must be installed on site, after the ceiling system is installed, the installation of the wiring is expensive and the overall time necessary for constructing the space is increased. In addition, the wiring is easily disturbed by technicians working in the space.
Prior art ceiling grid systems have included raceways in the ceiling grid elements to decrease the amount of clutter and keep the wire better organized. These grid elements include a single raceway and the raceways have been located at the bottom of the grid elements. As a result the raceways cannot carry both high and low voltage wire and they must be accessed from below the ceiling. Thus, separate raceways must still be placed above the suspended ceiling and at least a portion of the wiring must be installed on site after the ceiling system is in place. As a result, the prior art ceiling grid systems do not completely solve the foregoing wiring problems with suspended ceiling systems of this type.
The subject invention overcomes the limitations and shortcomings of the prior art suspended ceiling systems by providing a plurality of grid elements which are interconnected in an orthogonal grid pattern. An upper raceway is located at the upper portion of the grid element. The upper raceway has side by side sidewalls and a bottom and is accessible from above the grid system.
The foregoing and other objectives, features, and advantages of the invention will be more readily understood upon consideration of the following detailed description of the invention, taken in conjunction with the accompanying drawings.
Referring now to
In a preferred embodiment the grid element also includes a second cavity 38 which is located below the first cavity 24 and opens downwardly. In the embodiment illustrated a web 41 extends between the first cavity and the second cavity, but the web is not necessary and the two cavities can be located directly on top of one another. In a preferred embodiment the second cavity also has tabs 40 located midway in its sidewalls 42. The tabs 40 engage a plate 44 which can be inserted into the second cavity to divide it into a top portion 38(a) and a bottom portion 38(b). Openings 46 are located in the sidewalls 42 to provide access to the top portion. A pair of inwardly facing catches 48 located at the bottom of the second cavity 38 engage a cover 50 which releasably encloses the bottom portion 38(b). If desired, a light 52 can be placed in the second cavity and a translucent cover 54 attached to the catches 48,
The grid system 10 provides a wire raceway that is integral with the grid elements 12 that opens upwardly and can be accessed from the walkway located above the suspended ceiling and the fan filter units. In addition this raceway can be divided into two portions thereby allowing high voltage and low voltage wiring to be carried independently of one another. This latter configuration is shown in
In use, the grid system provides multiple ways to carry the wiring that travels through the suspended ceiling system, with the wire being contained in raceways that are part of the grid elements. Moreover, the raceways extend longitudinally and laterally in the space the system is located in which permits flexibility in how the wire is arranged. In addition, wire can go between the upwardly facing raceway and the downwardly facing raceway by either passing it through the tubes 56,
The system minimizes or eliminates the need for cable trays or cable drops in the space above the ceiling grid. This clears out the space and allows easier access for maintenance activities and allows the space to be used for other utilities, such as air ducts. In addition the system minimizes the cost for installing and reconfiguring wiring since the wiring can be installed before the grid system is placed into the space thereby allowing technicians to work at deck level rather than working overhead. In addition the grid system reduces the cost and construction schedules by permitting most of the wiring to be installed in a factory before the grid system is installed in the space. The grid system can be used to power components in or on the grid system, such as recessed lighting, organization units, signing, etc. and can be used to power components not attached to the grid.
The terms and expressions which have been employed in the foregoing specification are used therein as terms of description and not of limitation, and there is no intention, in the use of such terms and expressions, of excluding equivalents of the features shown and described or portions thereof, it being recognized that the scope of the invention is defined and limited only by the claims which follow.
Cursetjee, Zareer, Richardson, Laird I.
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